Carbureter



IRVIN E. BARRICKLOW, 0F SAN FRANCISCO, CALIFORNIA.

CARBURETER.

Specification of Letters Patent.

Patented Aug. 5, 1919.

Application tiled October 18, 1917. Serial No. 197,233.

To all whom t may concern:

Be it known that I, InvrN E. BARRICKLOW, a citizen of the United States,residing at the city and county of San Francisco and State ofCalifornia, have invented new and useful Improvements in Carbureters, ofwhich the following is a specification.

This invention relates to a carbureter for internal combustion engines;and one of the objects of the invention is to provide a simple andeffective construction which can be used with gasolene or with lowergrade fuels, such as distillate, kerosene and the like, or in whichgasolene may be employed for starting the engine and the lower gradefuel for running the engine under load when it has been sufficientlyheated. Another object oiI the invention is to provide means operable inunison with the throttle valve for automatically maintaining apredetermined opening between the needle valve and the throttle valve,so that a uniform mixture may be maintained regardless of the opening ofthe throttle. Another object of the invention is to provide means forsupplying water vapor to the explosive mixture and in conjunctiontherewith to provide means for automatically admitting and varying saidmixture in accordance with the speed of the engine or the load thereon.Further objects will hereinafter appear.

The invention consists of the parts and the construction and combinationof parts as hereinafter more fully described and claimed, havingreference to the accompanying drawings, in which- Figure 1 is a central,vertical, longitudinal section through the carbureter.

Fig. 2 is a side elevation of same.

Fig. 3 is a plan section on line 3--3 of Fig. 4.

Fig. 4 is a plan view of the bottom section of the carbureter.

Referring to the drawings in detail, A indicates a cylindrical-shapedcasing, the upper end of which is flanged as at 2, to permit it to besecured to the intake manifold of an internal combustion engine. Mountedin the upper end of the casing is a throttle valve, generally indicatedat 3, and mounted in the lower end of the casing is a spray nozzle 4 anda needle valve 5.

The spray nozzle is formed in a removable bottom section which consistsof a threaded, annular iange 6 adapted to be screwed into the lower endof the casing, as shown at 7. Formed integral with said threaded,annular Bange are three arms 8, 9 and 10, and supported by said arms,centrally of the flange, is a center section 11 1n which is mounted aplug valve 12. Formed in the upper part of the center seetlon is thespray nozzle 4, and supported by the center section and surrounding thespray nozzle is a cone-shaped cap 13. on the lower end of which isformed an annular flange 14. The cap 13 is spaced from the nozzle as isalso the flange 14, thereby forming an air passage which willhereinafter be termed the primary air inlet.

The arms 8, 9 and 10 are each provided with a passage (see Figs. 1 and4); the passage 8 being connected with a source of gasolene supply, thepassage in arm 9 with a distillate tank, and the passage in arm 10 witha source of water or Water vapor supply, as the radiator of a car. Thepassages formed in the arms 8 and 9 communicate with the plug valve andas this is provided with one radially disposed passage 15 and a centralvertical passage 16, turning of the plug valve, by means of a handle 17,permits either gasolene or distillate to be delivered to the spraynozzle; the discharge through the nozzle being regulated mechanically bythe needle valve 5, as will hereinafter be described. A stuffing box 18is preferably placed on the lower end of the plug valve to preventleakage at this point.

The passage formed in the arm 10 does not communicate with the valve butwith a vertically extending tube 19 which passes through the flange 14formed on the cap 13. The discharge of vapor through the pipe 19 intothe carbureter proper is controlled by a piston valve. This piston valveconsists of a cylindrical section 2O and an annular flanged, inturnedbottom section 21. This bottomv section of the piston valve is normallyada ted to seat on the flange 14 and when in this position forms aclosure for the passage 19, thereby preventing water vapor from enteringthe carburetor except when the piston valve is lifted from its seat. Thevalve is not only retained on the seat by means of its own weight butalso by a spring 2Q- interposed between the valve and n pair of bracketarms 23 fori-ned in the renter portion of the casing. These bracket,arms also carry a centralhhub member 24 casing A and is provided forthe purpose of supporting the throttle valve and also as a support :lora ffani 2G. Extending half way into the throttle valve and securedthereto in any suitable manner is a sleeve shaft 27, and secured on theouter end of said sleeve shaft is a lever by which tthe throttle valveis opened and closed from the steering,l wheel of the car in the usualmanner.

Formed on the sleeve shaft 27, adjacent to the lever 28, is a bellicrank member 29, and carried lby each iarm of the seid miember is anadjustin screw 30 which sadapted to engage a stop ug 31 formed on theouter face of the casing A; the crank wrms .'29, to-

ether with the set screws carried thereby,

eing rovided `to limit the movement of the thrott e valve. The shat. 25,Whiohourries the cam 2G, extends beyond the Sleeve shaft 2T and therebyserves as a support for an arm 32 which ermits the position of the cam26 to be a justed with relation to 'the throttle valve. This isaccomplished by forming a lug 33 on the throttle valve lever 28 whichcarries an adjusting screw 34. This screw .passes 'through fa slotin-the aum 32 and a spring -35 vintenposed between vthe arm 'and the lug33 'normally retains the shaft 25 and cum 26 in a, fined vand adjustedposition with lrelation to the throttle verve oncenn adjustment has beenmade.

The lcam 26 =is positioned in 'direct alinement with the -stem 15 of the-needle `velfve and its 'face is suiciently wide to Aengage the same.The Ilar er portion of *the cam engages the stem d the needle valve whenthe'throttle valve iis" raotically closed, thereby forcing the nee leVvalve down against the s ray nozzle and completely reventing anyischarge thererom. A shg t opening movement of the throttle valve,however, turnsthe com to a position where the Ineet'ile valve muy open aproportioned amount. Further opening of the throttle waive permits agreater opening of the needle valve and 4it is, ftherefore, possible 1tomaintain la proportional opening between the needle valve and throttlevalveet all times, regardless of their position, which automaticallymaintains a uniform mixture. The setting of the cam, which may beadjusted by means of the screw 34, is preferably such that idlingposition of the throttle valve will permit a slight opcnin r of theneedle valve, this being necessary wien starting and also when idhng.

In actual operation, when lt is desired to start Athe engine, it is onlynecessary to turn the lever li?, with connected plug` valve untilconnection is made with the gasolene passage formed on the arm 8.Cranking of the Car will then create a suiicient suction in the intwkemanifold and carburetor to permit air to be drawn through the spaceformed between the airins 8, 9 and 10 and the space formed between thespray nozzle and the oa 13, this air passing under the needle va ve inthe direction of arrows a lifts i1; suficiently to ermit thc desiredamount oi fuel to .pass t rough the, nozzle. A practically homogeneousand rich mixture is thus obtained as the primar Y air inlet open insg iSannular and the needle valve is provided with an annular shoulder 5",over which the ai'r and gasolene is evenly distribuited. rvlhe langeannular contact area thus provided .permits `a better atomization;hencel a illetter mixture is obtained.

'Starting of ruhe engine or idlinr speed requires `comrparatively`little air. "h1s air is, therefore, supplied entirely through theprinrairy laiir iirnlet opening and movement or admission of air throughthe piston valve is not obtained until the speed is increased. Thehigher suotions produced under greater speeds 4l'iits ythe valve awayfrom the shoulder or seat 114 against the tension of spring 22 :andadmits a secondary supply of air between the shoulder 14 and the lowerend of the :piston valve. A leaner mixture under hrigh speeds may in`this manner be obtained While a comparatively rich mixture may bemaiintained fior starting -by regulating the position orf the cam withrelation -to the needle vailve und zli'heth-rottle valve. A rich mixturemaiy also be obtained VWhen the enpine is running 'et .high speed andunder =a ieevy load by again adjusting the position of the cam. -Theseadjustments, however are made when 'theoarbureter is first appliedtoanengine end one setting or adjustment is generally suliicient toregulate the mixture so .that it vis ideal *for different speeds andloads.

The ipresent construction and 'arrange ment of yipnrts Vpermit faIcompact, simple larrangement Whioh vimay be easily adjusted for varyingconditions and, furthermore, permitan engine'to be started on gesolenewheneold and to be run on distillate or any therJsuitable low fgradefuel, once the engine has become heated Athe change being permittedwithout stopping theengine as ya connection between 'the dashboard andthe lever 17 permits the position of the plug valve to be instantlychanged from gasolene to distillate. The Water vapor is only admittedwhen the piston valve opens, or, in other Words, when the engine isrunning inder comparatively high speeds or heavy Everything provided isautomatic in operation as regards water vapor admission and theregulation of fuel, as the needle valve can only open in proportion tothe opening of the throttle. The ma'or portion of the air Will at ailtimes pass t rough the annular primary air opening, and as this isarranged around the spray nozzle a homogeneous mixture is obtained. Thewings of the throttle valve are preferably offset with relation to eachother, as shown in Fig. 1, to permit the valve to assume an absolutelyvertical position when entirely opened.

The materials and finish of the several parts of the carburetor may besuch as the experience and judgment of the manufacturer may dictate.

I wish it understood that various changes in form, proportions and minordetails of construction may be resorted to within the scope of theappended claims and that I do not wish to limit myself to the specificdesi and construction here shown.

ving thus described my invention, what I claim and desire to secure byLetters Pat ent is- 1. In a carburetor, a needle valve ha'ving a stemthe upper end of which is free, a throttle valve, a cam connected to thethrottle valve and having wiping engagement with the free upper end ofthe needle valve stem, and a positive connection between the cam andthrottle valve having turnable threaded means for adjusting the positionof the cam with relation to the throttle valve by mere turning of thethreaded means.

2. In a carburetor, a needle valve having a stem the upper end of whichis free, a throttle valve having a lever, a cam adjustably connected tothe throttle valve and having wiping engagement With the free upper endof the needle valve stem, an arm in connection with the cam, a screwconnection be tween said arm and lever for adjusting the position of thecam with relation to the throttle valve.

3. A carbureter comprising a casing, a spray nozzle mounted in the lowerend of the casing, a cone-shaped cap spaced from and surrounding thenozzle forming a rimary air inlet, a piston valve slidaibly mounted inthe casing adapted to seat on the cap and to open or close a secondaryannular air inlet formed between the cap and the casing, a throttlevalve in the casing,

and means for admitting a Water vapor to the carbureter, said meanscontrolled by the piston valve for regulating the amount of vaporadmitted. l

4. In a carbureter in combination with a throttle valve and a needlevalve, a shaft, a cam on said shaft for operating the needle valve, asleeve turnably surrounding' said shaft, a lever connected to saidsleeve to operate the throttle valve, a bell crank member on saidsleeve, means engaging each arm of said member to limit the movement ofthe sleeve, an arm on said shaft to adjust the position of said shaftand thereby that of the cam, an adjusting screw carried by said lever ofthe throttle valve and having connection with said arm of the shaft, anda spring encircling said screw for holding the shaft and cam in theiradjusted position.

5. In combination with the throttle valve and the needle valve of acarbureter, a cam for operating the needle valve, a lever for operatingthe cam, an arm connected to the throttle valve and a screw connectingthe arm and lever to effect operation of the cam upon movement of thearm and to enable adjustment of the position of the cam relative to thethrottle valve by mere turning of the screw.

6. In combination with the throttle valve and the needle valve of acarbureter, a shaft, means operated by said shaft to actuate the needlevalve, a lever on said shaft to operate saine, a sleeve supporting thethrottle valve, an arm connected to said sleeve to operate same, and aturnable threaded connection between said arm and lever to effectadjustment by mere turning of the threaded connection and operation ofsaid needle valve actuating means upon operation of the throttle valve.

7. In a carbureter, a casing, a nozzle in the casing, a cap spaced fromthe nozzle to form an air inlet and having an outwardly extending fiangeat its base, a tube in communication with a source of Huid supply andhaving its upper end extendin through said iiange, said flange being sace from the side walls of the casing to al ow the passage of air, and apiston valve in the casing engageable with the upper end of the tube toclose same and also being engageable with said iiange to prevent thepassage of air thereast. p In testimony whereof I have hereunto set myhand in the presence of two subscribing witnesses.

IRVIN E. BARRICKLOW. Witnesses:

THos. CAs'rBnne, GENEVIEVE S. DONELIN.

Uopiel o! this patent may he obtained for ilve cents each, by addressingthe Commislinner of Patents, Washington, D. G.

